Zhang Zhiyuan, Zhou Hengtao, Wang Xutao, Zhang Lilin, Rao Peijun, Zhu Huanguang
School of Energy & Architectural Environment Engineering, Henan University of Urban Construction, Pingdingshan 467036, China.
Department of Architectural Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China.
ACS Omega. 2022 Mar 31;7(14):11862-11870. doi: 10.1021/acsomega.1c07311. eCollection 2022 Apr 12.
An inherent water-soluble sodium-loaded coal sample was prepared using crown ether for this study. The pyrolysis process of an inherent water-soluble sodium-loaded coal sample and a water-soluble sodium compound-loaded coal sample was researched by thermogravimetric analysis (TGA). Also, the pyrolysis kinetics of the coal samples were analyzed and researched by the distributed activation energy model (DAEM). The results show that the inherent water-soluble sodium is mainly concentrated on coal particles, which further aggravates the degree of the pyrolysis reaction. The presence of sodium can promote the weight loss of coal samples in the preliminary stage of pyrolysis and the thermal condensation stage, block the escape of volatile matter during the main pyrolysis period, and inhibit the process of graphitization of char. The activation energy of pyrolysis increases with the carbon conversion rate, and the presence of sodium can reduce the activation energy under the same carbon conversion rate.
本研究使用冠醚制备了一种内在水溶性载钠煤样。通过热重分析（TGA）研究了内在水溶性载钠煤样和水溶性钠化合物载煤样的热解过程。此外，采用分布活化能模型（DAEM）对煤样的热解动力学进行了分析和研究。结果表明，内在水溶性钠主要集中在煤颗粒上，这进一步加剧了热解反应程度。钠的存在可促进煤样在热解初期和热缩聚阶段的失重，在热解主期阻碍挥发分逸出，并抑制半焦的石墨化过程。热解活化能随碳转化率增加而增大，在相同碳转化率下，钠的存在可降低活化能。
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